OLED Display Panel Technology

Display panel OLED (organic light emitting diode) has been considered as a next-generation display panels that can replace the LCD (liquid crystal display) and PDP (plasma display panel). In fact, the current panel OLED display has been applied in small size displays such as mobile phones and display large size displays like television.

OLED panel originally called organic elektroluminesens panel (electroluminescence). Elektroluminesens panel is a panel that uses organic light emission due to recombination of electrons and holes (positive charge carriers) generated by organic material. Because it has a light transmitting principles similar to pamancaran light on the LED (light emitting diodes), organic elektroluminesens panel ultimately referred to as an OLED panel.

OLED panels are characteristic of a structure with a design consisting of a light-emitting organic material. Emission of light occurs because the electric current flowing through the organic material. Organic material is usually inserted between two electrodes.

During the light emitting organic material (self-luminous), OLED display panel always displays images that are cleaner and sharper than the LCD panel is equipped with a backlight (backlight) to emit light. The absence of components and structures has led backlight OLED display panel on the reduction of thickness so it is very thin and thinner than most LCD panels.

OLED display panel consists of a light-emitting layer of organic material is inserted between two electrodes (cathode and anode) and the other layers to increase the efficiency of lighting. In between these layers, a layer of organic material plays an important role in regulating the efficiency of light (luminous efficiency) and the use of OLED display panels.

Organic material, which acts as a transmitter of light, available in two types based on molecular mass of organic mixtures are used, namely the type of low molecular and high polymer type. Two types of organic material does not have significant differences in terms of the principle of transmitting light.

The principle of light emission has been found earlier in the low molecular type organic material. Manufacture of OLED display panels with a material of low molecular type organic material in general use a process known as the vacuum deposition method. However, this method requires a high temperature when the deposition process be done to change the low molecular type organic material into the gas phase.

Effect of temperature becomes more significant for the size of the OLED display panel is greater. Therefore, the current manufacture of OLED display panels using a low molecular type organic materials are rarely implemented. However, it is expected in the future in a vacuum deposition system is more advanced and evolved so that the production of panels of large size OLED displays become more possible.

On the other hand, the manufacture of OLED display panels with a material of high polymer type organic material can be made of them by an inkjet method (ink spray). This method of applying organic materials into areas of pixels on a substrate, using a process similar to inkjet printing. This inkjet method produces the level of material consumption efficiency is higher than the vacuum deposition method.

OLED display panel drive system can use a type of passive matrix or active matrix type. Panel passive matrix type OLED display has a wire conductor that is placed in a horizontal direction (often called electrodes X) and vertical direction (often called a Y electrode). When an electric current flowing in the wire conductor, the pixels appear to give off light at the intersection (crossover point) conductor wire. Flux of electric current in the wire conductors associated with the number of pixels is generated, the greater the voltage is applied then the resulting light pixels get lighter and lighter. Since the display panel of the type of passive matrix OLED requires a big power, even greater than the active matrix type OLED display panels, OLED display panel of the most efficient passive matrix type used to display text and icons, and most suitable for small-sized screen (diagonal screen size of two to three inches) as on-screen mobile phones, PDAs, and MP3 players.

Panel Type active matrix OLED display has a structure consisting of a layer arrangement of cathode, organic molecules, and the anode. Stretch of the anode layer on an active matrix type arrangement of the TFT (thin film transistor) that form a matrix. The composition of the TFT is nothing but a circuit that determines the selection of pixels for forming an image.

Panel type Active matrix OLED displays require a complicated circuit formation despite the type of active matrix provides a faster response time and higher resolution than passive matrix type. Other advantages of OLED display panel active matrix type is the electric power consumption is lower than the electrical power consumed panel passive matrix type OLED display.

Power consumption is lower due to the presence of the circuit in the form of TFT devices that require electrical power is smaller than the outer series of panels that use passive matrix type OLED display. Panel type Active matrix OLED display is more efficient for large-sized displays, such as computer, television screen size and electronic billboards.*** [ILHAM BUDIMAN | PIKIRAN RAKYAT 21072011]